As you can see in the following, I had great trouble navigating in the editor. I was using Chrome on a Mac. The GIF is small but I hope you can see that the interface kept going beyond where I wanted to go. I tried to drag it but the same overshoot problem occurred and I couldn’t find a way to stop it. Ultimately, I had to type in the name of the column I wanted in order to edit it – not the best option.
P.S. Safari is better in regard to this issue on my machine but, of course, given that AppSheet is part of Google now, Chrome should be better.